An e is moving along the +x direction with velocity . It enters a region of the uniform of 300 V/cm pointing along +y direction. The magnitude and direction of the magnetic field set up in the region such that e- keeps moving along the x- direction will be:
Option: 1 along -z direction
Option: 2 along -z direction
Option: 3 along +z direction
Option: 4 along +z direction